Meter-testing service cut-out.



T. E. MURRAY.

METER TESTING SERVICE OUT-OUT.

APPLICATION FILED DEC. 8. 1909.

Patented May 2, 1911.

4 SHEETS-SHEET 1.

lNl/f/VTOR M BY a WITNESS s.-

} ATTORNEY T E MURRAY METER TESTING SERVICE GUT-OUT.

- APPLICATION FILED DEC. 8, 1909. 991mm Patented May 2, 1911 4 SHEETSBHEET 2.

T. -E. MURRAY.

METER TESTING SERVICE GUT-OUT.

APPLICATION FILED DEC. 8. 1909.

Patented May 2, 1911.

ySHEETS-iHEBT s.

Ill/VENTOR ORIVEY T. E. MURRAY;

METER TESTING SERVICE GUT-OUT.

APPLICATION FILED 13110.8, 1909.

991,0Q4, v Patented May 2, 1911.

4 SHEETSSHEET 4.

LL 72 13 i T Z Q ilmcooeo: u gvwewtoz r as t, 5mm

rrromes E. MURRAY, or new YORK, 1v. Y.

METER-TESTING- SERVIGE GUT-OUT.

cornea.

Specification ofLetters Patent.

Application filed December 8, 1909. Serial No. 532,049.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, a citizen ofthe United States, residing'at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Meter- Testing Service Cut-Outs, ofwhich the tol lowing is a specification.

The invention is a meter testing service cut-out for'electrical installations; It has for its object to simplify the tes mg of consumers meters while in service.

. Hitherto this has required apparatus occulines y, 3/

pying considerable space, and more or less complicated. In all installations a cut-out (and fuses) is usually interposed between the main supply and local conductors. I combine all the necessary testing connections and certain removable switch and brldgepieces directly with the cut-out support, so that by simply applying said pieces to contacts on said support, I am enabled to establish or cut off service, to remove the meter, to test the meter on customers load, or to test the meter with artificial load; the meter removal and testing being, in each case, accomplished without interruption of the customers service.

In the accompanying drawings-Figure 1 is a plan view of my meter testing service cut-out, the fuse cases and removable bridge and switch pieces being absent. Fig. 2 is a section on the line 00,412, of Fig. 1 showing a fuse case in place. Figs. ,3, 4 and -5 are horizontal sections of the projection K respectively on the lines '1 y, of Fig. 6, z, z, of

Fig. 7, and 'w, w, of Fig. 8. Figs. 6, 7 and 8 are vertical sections of the projection K' showing the removable switch and bridge piecesin place, taken respectively on the of Fig. 3, a, z, of Fig. 4, and w, w, of F 1g. 5. Fig. 9 is an-elevation of the switch piece V. Fig. 10 is an elevation of the switch piece U, and Fig. 11 is aerspective view of the bridge piece T. *igs. 12, 13 and 14 are diagrams-Fig. 12'illustrating the service connections of the cutout, Fig. 13 the standardizing apparatus arranged for testing the meter on normal or customers load Without interruption of service, and Fig. ,14 the standardizing apparatus arranged for testing the meter with artificial load without interruption of service.

Similar numbers and letters of reference Patented May 2, 1911. I

main supply conductors 1, 2 enter the block through passages F in a .wall thereof, and

are respectively connected to the plates in sockets O; E. Fuse plugs, one of which is shown at H, Fig. 2, also of porcelain or like material, containing fuses having their terminals connected in the usual way to end contactplates I, fit in the sockets B, O and D, E, and establish electrical connection with the spring arms therein.

On the block A is a projection K in which are four recesses, L, M, N, O. In said recesses are metal strips 5, 6, 7, 8. The strip 5'connects with the spring arms in socket B-dotted lines Fig. 1. The strip 7 is con-' nected to a strip 9 which extends through a diagonal channel on the under side of the block, passes through a wall and enters a recess P in a horizontal projection Q on said wall. The strip 8 connects with the spring armsin socket D. The spring arms in socket B are also connected to a strip 10 which enters a recess R in projection Q. The conductors 11, 12 which supply current to the local or customers installation are connected respectively to the strips 9 and 10. On the strips5, 6, 7, 8 are upwardly extending contact plates 13', 14, 15, 16 which are in line across the projection K. On the strips 6, 7 are upwardly extending contact does not extend to the outer ends of said recesses. I In order to make the service connection, the contact plates 17, 18 are bridged by a removable bridge piece T, Fig. 11, having spring clip arms which receive said contact plates between'them. One side of the piece T is slotted, as shown at 19, to receive the end of the short; partition S, Fig. 3. The two parts of the piece on each side of the' slot bear respectively against the inner sldes of the contact plates 17 .18, while the unslotted and parallel part of the plate bears on the outer sides of said plates. The upper portion '20 of the piece may be bent over, as shown, to form a convenient means for graspingthe piece in the fingers, to a ly;a ;10.,.,,

to or remove it from the contact plates 17,18.

In Figs. 12, 13 and 14, the meter X, dia- .one part of the circuit, namely, between strips 6 and 7; and that this gap may be closed by placing the bridge piece T upon thecontact plates 17, 18. Hence all that is required to establish or break the customers circuit is to apply the bridge piece T to the contact plates 17, 18, or to remove the same therefrom. See Fig. 12. v

I will now descr'be the apparatus for meter testing.

I. Testing on customers load without in temiotion 0f seroioa-For this purpose I employ the removable switch piece U, Fig. 10. This comprises a holder 21 of wood or other non-conductor, from which depend four separated metal spring clips secured in place by the binding screws 22, 23, 24, 25. To the screws 22, 25 are connected the ter minals of the voltmeter 26, and to the screws 23, 24 are connected the terminals of the ammeter 27. The service connections being as-shown in Figs. 6 and 12, and the bridge piece T being in place, theclips of switch piece U are adjusted upon the contact plates 13, 14, 15, 16. 'After this is done the switch piece T is removed. The conditions are then as shown in Figs. 7 and 13, the local circuit being closed through the measuring instruments (Fig. 13): fromplus main conductorv to local conductor,

across the load indicated by the lamps to minus local conductor, plates 24, to ammeter 27, to plates 23, meter armature c, to plates 25 and minus main conductor. The meter field coil cl is in shunt from plus main conductor to plates 22, plates 25 and minus main conductor. Particular attention is called to the fact that no interruption of service is here caused, since the testing circuit is closed by the switch piece U before the. switch piece T is removed.

II. Testing with artificial load and without interruption of ser'vice.For this purpose I provide the removable bridge pieceV,

having a suitable handle and shown in Fig 9. This comprises a holder 28 of wood or other non-conductor, from which depend a spring clip 29,- a spring clip 30, and spring clips 31 bridged at 32. The last named clips are preferably formed and bridged by slotting a single-plate, as shown in Fig. 9, The

clips are secured in place by the binding posts 33, .34, 35, 36. The terminals of the circuit, including the artificial load 37 and ammeter 27, are connected to the binding posts 33, 34, and the terminals of the voltmeter'26 are connected to the bindingposts 33, 36. The bridge piece T being in place, the iece V, as shown in Figs. 5 and 8, is apphed, so that the contact plates 13, 14, 15, 16 are received in the clips. After this is done the bridge piece T is removed. The circuits are then as follows (Fig. 14) from plus main conductor to plus local conductor,

across the load indicated by the lamps, to minus local conductor, plates 35, bridge V to minus main conductor; Plates 33 and 36 are connected respectively to plus and minus main conductors, and between them proceed the following shunts;:-from plate 33 to am-- meter 27 and artificial load 37 ,to plate 34, meter armature a and plate 36. From plate 33 to voltmeter 26 and plates 36., From I plate 33 to meter field coil al and plate 36.

The apparatus may also be arranged so as to enable the meter to be removed without interruption of service. All that is required to this end is to place both the bridge piece T and the switch piece V in their respective positions, as already described. In Fig. 14

the dotted lines indicate the bridge piece T thus used conjointly with switch piece V.

I claim: L v

1. In combination with service line conductors, local conductors,-standardizing apparatus, a meter and a support, contact terminals on said support in the meter circuit, a removable bridge piece coiiperating with said terminals, a removable switch piece,

contact terminals on said support cofiperating with said switch piece, and circuit connections as set forth, whereby when said bridge piece is in place circuit is closed to the meter and said local conductors, and when said switch piece is in place and said bridge piece removed circuit is closed to said meter, said standardizing apparatus and said local conductors.

2. The combination in an electric cut-out support having a plurality of separate re cesses, circuit terminal platesin said recesses, contact plates extending outwardly from said terminal plates and disposed in line across said recesses,rmain and branch conductors, circuit connections between said terminal plates and said conductors, and a removable bridge piece constructed tobe received upon two of said contact plates. v

3. The combination in an electric cut-out .support having a plurality of separate recesses, circuit terminal plates in said recesses,. contact plates extending outwardly from said terminal plates and dis osed in line across said recesses, main an branch conductors, circuit connections between said terminal plates and said conductors, a

holder, a plurality of clips thereon constructed to be received respectivel upon said contact plates, and means on sai holder for connecting said clips in circuit.

4. The combination in an electric cut-out support having a pluralityof separate recesses, circuit terminal plates in said recesses,

contact plates extending outwardly from i said terminal plates and disposed in line across said recesses-main and-branch con-' 10 ductors, circuit connections between said terminal plates and said conductors, a holder, a plurality of clips thereon, two of said clips being constructed to be received respectively upon two of said contact plates, and two of said clips being constructed to be 15 received upon and to bridge the remainin two of saidcontact plates, and means on sai holder for connecting said clips in circuit.

In testimony whereof I have afiixed my signature in presence of two witnesses.

THOMAS E. MURRAY. Witnesses: I1

GERTRUDE T. PORTER, MAY T. MCGARRY. V 

